Parts of an Equation & Reaction Types

Parts of an Equation & Reaction Types

Parts of a Chemical Equation

A subscript is the number

To the lower right of the chemical symbol that represents the number of atoms in a single molecule of an atom.

Coefficients

Are the LARGE NUMBERS located to the left of a chemical symbol.

An important thing to remember is that EVERY SYMBOL behind a coefficient gets multiplied by that coefficient.

Symbols in an equation

• (g) substance is a gas

• (l) substance is a liquid

• (s) substance is a solid

• (aq) aqueous, the substance is dissolved in water

• + separates the substances on the reactant or product side of the equation.

•  $\rightarrow$  yield, it separates the reactants and products.

Multiple Choice

Chemical equations

• give directions for naming compounds

• describe only biological changes

• describe chemical reactions

• show how to write formulas

Multiple Choice

What does this symbol Δ above the arrow mean?

• a precipitate is form

• heat is supplied

• a calalyst is needed

• electricity is needed

Multiple Choice

CaCO₃ represents a chemical

• Symbol
• Formula
• Subscript
• Reaction

Multiple Choice

 $C_2H_6\ +\ 5O_2\ \rightarrow\ 2CO_2\ +\ 3H_2O_2$  
Given this chemical equation, what are the REACTANTS?

•  $C_2H_{6\ }and\ 5O_2$  

•  $2CO_2\ and\ 3H_2O_2$  

Multiple Select

Which of the following represent chemical equations? Check all that apply.

• $2Na\ +\ H_2O\ \rightarrow\ 2NaOH\ +\ H_2$

• $2KClO_3\ \ \rightarrow\ 2KCl\ +\ 3O_2$

• $2Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3$

• $2H_2O$

• $3O_3\ ,\ H_2O$

Multiple Choice

What is the number before a chemical formula called?
Ex: 2H₂ + O₂ --> 2H₂O

• Coefficient
• Subscript
• Atom
• Equation

Multiple Choice

Number six (6) is indicating ____ of the equation.

• solid

• liquid

• gas

• aqueous

Multiple Choice

Number five (5) is indicating ____ of the equation.

• solid

• liquid

• gas

• aqueous

Multiple Choice

The number four (4) represents which part of the equation?

• aqueous

• gas

• liquid

• solid

Multiple Choice

A coefficient tells you...

• the # of atoms in the entire equation
• the # of elements in the equation
• the # atoms of the element it sits behind
• the # of molecules of that substance

Multiple Choice

A subscript tells you...

• the # of atoms in the entire equation
• the # of elements in the equation
• the # atoms of the element it sits behind
• the # of compounds present

Multiple Choice

Which is NOT an indicator of a chemical change?

• temperature change
• formation of a precipitate
• shape change
• production of light

Multiple Choice

______ is the end result of a chemical reaction.

• Product

• Yield

• Subscript

• Reactant

Multiple Choice

What is a Yield in a chemical reaction?

• The arrow that separates the product from the reactant.

• The end result of a chemical reaction.

• The number before a chemical formula that shows the number of molecules present.

• A written description of a chemical reaction.

Multiple Choice

The number to the lower right of an element that shows the number of atoms bonded is called ?

• Product

• Subscript

• Chemical Formula

• Reactant

Multiple Choice

______ is the end result of a chemical reaction.

• Product

• Yield

• Subscript

• Reactant

Multiple Choice

The number before a chemical formula that shows the number of molecules present is call a?

• Yield

• Product

• Coefficient

• Reactant

Multiple Choice

One or two letters that represent the elements on the periodic table is called?

• The Chemical Formula

• The Chemical Equation

• The Chemical Symbol

• Coefficient

Five Types of Chemical Reactions

Multiple Choice

Which generalized equation represents a decomposition reaction?

• A + BC → AC+ B
• A + B → AB
• AB → A + B

Multiple Choice

Which generalized equation represents a synthesis reaction?

• A + BC → AC+ B
• A + B → AB
• AB → A + B

Multiple Choice

Ca₃(PO₄)2 + 3 H₂SO₄ + 3 CaSO₄ + 2 H₃(PO₄)

• Synthesis Reaction
• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction

Multiple Choice

Cu + 2Ag(NO₃) → 2Ag + Cu(NO₃)

• Synthesis Reaction
• Decomposition Reaction
• Single Displacement Reaction
• Double Displacement Reaction

Multiple Choice

Breaking down a substance into simpler substances

• Displacement
• Synthesis
• Decomposition
• Oxidation

Multiple Choice

Combining substances to form a new substance

• Displacement
• Synthesis
• Decomposition
• Oxidation

Multiple Choice

2Na +S → Na₂S

• Double Replacement

• Decomposition

• Combustion

• Synthesis

Multiple Choice

Evidence of a chemical reaction include:

• Phase change

• No new substance

• Bubbles forming

• Shape change

Multiple Choice

What type of chemical reaction is this one?

C₂H₂ + O₂ --> CO₂ + H₂O

• Decomposition

• Combustion

• Synthesis

• Single Replacement

Multiple Choice

What type of reaction is illustrated below?

Zn + H₂S --> ZnS + H₂

• synthesis

• decomposition

• single replacement

• double replacement

Multiple Choice

What type of reaction is illustrated below?

2HI --> H₂ + I₂

• synthesis

• decomposition

• single replacement

• double replacement

Multiple Choice

What type of reaction involves ions from 2 compounds exchanging places to form 2 completely new compounds?

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

• Decomposition Reaction

Multiple Choice

What type of reaction involves 2 substances combining to form 1 new compound?

• Decomposition Reaction

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

Multiple Choice

What type of reaction involves the breaking down of a substance into simpler substances?

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

• Decomposition Reaction

Multiple Choice

2 NaBr + 1 Ca(OH)₂ ----> 1 CaBr₂ + 2 NaOH

• Synthesis (or combination)
• Decomposition
• Single displacement
• Double displacement

Multiple Choice

What reaction has the following general formula:

AB + CD --> CB + AD

• Combination

• Decomposition

• Single Displacement

• Double Displacement

• Combustion

Multiple Choice

What reaction has the following general formula:

A + CD --> C + AD

• Combination

• Decomposition

• Single Displacement

• Double Displacement

• Combustion